Characteristics of dissolved organic matter in urban road runoff under different traffic densities in Beijing, China
Characteristics of dissolved organic matter in urban road runoff under different traffic densities in Beijing, China
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不同交通密度下北京城市道路径流溶解性有机物特征
DOI：
10.1007/s11356-022-21791-w
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发表时间：
2022-07
影响因子：
5.8
通讯作者：
Yingjie Zhu
中科院分区：
文献类型：
--
作者：
Xiaoli Du;Zhongwen Chi;Mengyao Chen;Zhenya Yu;Yingjie Zhu
采用树脂分级、分子量分布分析、三维荧光光谱和紫外-可见光谱等方法，比较了不同交通密度下道路径流中溶解性有机物（DOM）的特征。高交通密度显著增加了道路径流中DOM的浓度，导致溶解性有机碳含量增加。DOM分子量分布不受交通量的影响。DOM主要由分子量在1 kDa至0.45 μm范围内的胶体有机物组成。DOM中疏水性组分所占比例大于亲水性组分，疏水性酸随交通密度的增加而增加。交通密度没有改变DOM中的荧光物质，包括富里酸类紫外荧光物质和蛋白类物质。而在交通繁忙的道路径流DOM中发现了更多的类胡萝卜素蛋白质。此外，重交通对DOM的芳构化程度影响不大，而腐殖化程度降低。
The characteristics of dissolved organic matter (DOM) in road runoff under different traffic densities were compared using resin fractionation, molecular weight distribution analysis, three-dimensional excitation-emission matrix fluorescence spectroscopy, and UV-visible spectroscopy. Heavy traffic density strongly increased the concentration of DOM in road runoff, resulting in higher dissolved organic carbon. The distribution of molecular weights in DOM was not influenced by the traffic. DOM was dominated by colloidal organic matter with molecular weight in the 1 kDa to 0.45 μm size range. Hydrophobic fractions accounted for a large proportion than hydrophilic fractions in DOM, and hydrophobic acids increased with higher traffic density. Traffic density did not alter the fluorescent substances in DOM, including fulvic-like UV fluorescent substances and protein-like substances. However, more tryptophan-like protein substances were found in DOM from road runoff with heavy traffic. Moreover, the aromatization degree of DOM was not affected by heavy traffic, while the degree of humification decreased.
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